I doubt it would be legal. AFAIK possession of seeds is treated as possession of cannabis. I am a new South African grower myself and am also hesitant to order seeds online for fear of getting busted in such a ridiculous fashion. On the upside I think we are lucky to live in a region where you can easily obtain really potent sativas very cheaply. Myself I simply saved all the seeds from some really good (but poorly grown - not sensimilla) weed and am now growing directly from the germinated seeds.
South african dude
I will be updating soon as there is still some work to be done on my grow box and I still need to raise some mothers for cloning before things can start in earnest. Fortunately we here in the Southern hemisphere have gone past the Winter solstice, so it's downhill from here!